F4 Fault Code Glow-worm Boiler

Boilers are machines. Even the most reliable and well-maintained boilers can encounter issues from time to time.
Let's find out what the F4 error code is in the Glow-worm boiler.
🔍 What is the F4 error code?
[FLAME PROBLEM]
When your Glow-Worm boiler shows the F4 fault code, it means the boiler can’t detect a flame. Boilers need a steady flame to burn fuel and generate heat, so if the flame isn’t there, the boiler shuts down as a safety precaution. This "lockout" prevents risks like gas leaks or overheating but also stops your heating system from working.
🛠️ Possible Causes:
Let's see what causes the F4 error.
[STUCK GAS VALVE]
First cause is a stuck gas valve. This little component controls the flow of gas into your boiler. If it gets stuck, gas won’t reach the burner, and without gas, there’s no flame-triggering the F4 fault."
[WIRING OR CONNECTION PROBLEM]
Next, wiring or connection problems. Your boiler depends on electrical signals to operate smoothly. Loose or damaged connections can disrupt these signals, especially the ones that tell the system if a flame is present.
[FAULTY FLAME SENSOR]
Then there’s the flame sensor, a crucial part of the boiler. Its job is to check if the flame is burning. But if it’s dirty, damaged, or not working properly, it can’t do its job-resulting in that dreaded F4 code.
[BLOCKED BURNER JETS]
Burner jets are another potential culprit. Over time, these jets can get clogged with debris from fuel combustion. When that happens, the gas won’t ignite properly, causing the boiler to shut down.
[DAMAGED IGNITION JETS]
Your boiler also relies on the ignition lead to spark the gas and start the flame. If this lead is damaged, the boiler simply won’t ignite.
[FAULTY PCB]
And finally, the PCB-or Printed Circuit Board. This is like the brain of your boiler. If it’s malfunctioning, it might misread signals from various components, leading to the F4 fault.
🔧 How to Troubleshoot:
Let's find out how to fix the F4 error code.
[CHECK YOUR GAS SUPPLY]
First, check your gas supply. Make sure your gas bill is paid, and there’s no disruption in the supply. Sometimes, it’s the simplest things that can catch us off guard.
[RESET YOUR BOILER]
Next, try restarting your boiler. Pressing the reset button can often resolve minor software glitches. It’s like giving your boiler a fresh start!
[INSPECT THE FLAME]
And if your boiler has a visible flame, take a look to see if there are any blockages or irregularities. But remember, never attempt to clean or repair it yourself-leave that to the experts.
These quick checks could save you time and get your boiler running smoothly again.
[CALL A GAS SAFE ENGINEER]
If the problem persists, though, it’s time to call in a professional.
🏢 About Us:
At Serviceteam, our team of skilled Gas Safe engineers handles every make and model of gas and electric boilers. As a professional boiler installer, we meet the manufacturer's high standards and provide exceptional service and peace of mind.
📞 Need Help?
We guarantee to meet the highest standards set by the manufacturer.
We hope this video has been helpful. Click on the link below to book a Serviceteam heating engineer. Thanks for watching, and stay warm!
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